旁瓣约束方向不变恒定束宽波束自适应综合

将自适应加权方法应用于波束图的主瓣控制研究，提出了方向不变恒定束宽波束形成算法。在波束图旁瓣区域引入若干虚拟干扰源，自适应调整干扰强度，改变波束形状。以主瓣某一指向的波束宽度为参考，以每次迭代后波束图最低旁瓣峰值与主瓣峰值的差作为下次迭代运算的预设主旁瓣比，在保持主瓣区域宽度不变的情况下，用自适应综合的方法获得不同主瓣指向上的最低均匀旁瓣。将该算法应用于均匀线阵和半球面阵，均在±60°的范围内得到了方向不变恒定束宽波束。研究表明，该算法不仅适用于均匀线列阵，也可用于任意结构阵列。

Synthesis of adaptive steering-invariant constant-beamwidth pattern with sidelobe constraints

An adaptive pattern synthesis algorithm for steering-invariance constant beamwidth is presented. Based on the use of adaptive weighting algorithm for main lobe controlling technique, the shape of beam pattern is changed by introducing some virtual interferers in the side lobe domain and adjusting the strength of interferers at the same time. Using the beamwidth of main lobe when directed to a certain direction as a reference and using the difference between the peak value of main lobe and the trough value of side lobe as a presetting side lobe level for next iterative, the presented algorithm can get minimum uniform side lobes on different main lobe directions while keeping the width of main lobe invafiant. The algorithm is applied to uniform linear array and sphere array and gets the steering-invariance constant beamwidth beam pattern within ±60°. It shows that the presented algorithm is suitable for not only uniform linear array, but also arbitrary structure array.